78. During the synthesis of pyrimidine or the salvage of purine, which ribosyl substrate is needed?
(A) Ribose 1-phosphate
(B) Ribose 6-phosphate
(C) Phosphoribose pyrophosphate (PRPP)
(D) None of the above

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統計： A(1), B(3), C(3), D(0), E(0) #2769460